问角9或10 +角材料10:无法将导入解析为NgModule类

EN

import { NgModule } from '@angular/core';
import {
  MatFormFieldModule,
  MatLabel,
  MatHint,
} from '@angular/material/form-field';

@NgModule({
  imports: [MatFormFieldModule, MatLabel, MatHint],
  exports: [MatFormFieldModule, MatLabel, MatHint],
})
export class MaterialModule {}

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';

import { CUSTOM_ELEMENTS_SCHEMA } from '@angular/core';

import { MaterialModule } from './material.module';

import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { CarouselComponent } from './carousel/carousel.component';
import { DashboardComponent } from './dashboard/dashboard.component';
import { CrudComponent } from './crud/crud.component';
import { ProfileComponent } from './profile/profile.component';
import { LayoutComponent } from './layout/layout.component';
import { FooterComponent } from './layout/footer/footer.component';
import { HomeComponent } from './home/home.component';
import { AboutComponent } from './about/about.component';
import { LoginComponent } from './login/login.component';
import { PrivHeaderComponent } from './layout/priv-header/priv-header.component';
import { PrivMenuComponent } from './layout/priv-menu/priv-menu.component';
import { MainMenuComponent } from './layout/main-menu/main-menu.component';
import { MainHeaderComponent } from './layout/main-header/main-header.component';

@NgModule({
  declarations: [
    AppComponent,
    CarouselComponent,
    DashboardComponent,
    CrudComponent,
    ProfileComponent,
    LayoutComponent,
    FooterComponent,
    HomeComponent,
    AboutComponent,
    LoginComponent,
    PrivHeaderComponent,
    PrivMenuComponent,
    MainMenuComponent,
    MainHeaderComponent,
  ],
  imports: [
    BrowserModule,
    FormsModule,
    MaterialModule,
    ReactiveFormsModule,
    AppRoutingModule,
    BrowserAnimationsModule,
  ],
  providers: [],
  bootstrap: [AppComponent],
  schemas: [CUSTOM_ELEMENTS_SCHEMA],
})
export class AppModule {}

{
  "name": "mini-aplicacion",
  "version": "0.0.0",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "~10.0.5",
    "@angular/cdk": "^10.1.0",
    "@angular/common": "~10.0.5",
    "@angular/compiler": "~10.0.5",
    "@angular/core": "~10.0.5",
    "@angular/forms": "~10.0.5",
    "@angular/material": "^10.1.0",
    "@angular/platform-browser": "~10.0.5",
    "@angular/platform-browser-dynamic": "~10.0.5",
    "@angular/router": "~10.0.5",
    "rxjs": "~6.5.4",
    "tslib": "^2.0.0",
    "zone.js": "~0.10.2"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "~0.1000.4",
    "@angular/cli": "~10.0.4",
    "@angular/compiler-cli": "~10.0.5",
    "@types/node": "^12.11.1",
    "@types/jasmine": "~3.5.0",
    "@types/jasminewd2": "~2.0.3",
    "codelyzer": "^6.0.0",
    "jasmine-core": "~3.5.0",
    "jasmine-spec-reporter": "~5.0.0",
    "karma": "~5.0.0",
    "karma-chrome-launcher": "~3.1.0",
    "karma-coverage-istanbul-reporter": "~3.0.2",
    "karma-jasmine": "~3.3.0",
    "karma-jasmine-html-reporter": "^1.5.0",
    "protractor": "~7.0.0",
    "ts-node": "~8.3.0",
    "tslint": "~6.1.0",
    "typescript": "~3.9.7"
  }
}